- Uninsured motorist coverage can respond when an at-fault driver has no applicable liability insurance, subject to policy and state law.
- Underinsured motorist coverage addresses a gap when the at-fault driver’s liability limit is insufficient for a covered loss.
- Bodily injury and property damage components can be offered or required differently by state.
- Limits, deductibles, offsets, stacking and hit-and-run rules must be read in the actual policy.
Understand the purpose of uninsured and underinsured motorist coverage and the state-specific limits, definitions and stacking rules to verify. The examples below are explanatory, not product quotes or promises of approval, savings, coverage or investment performance.
Coverage for another driver’s insurance gap
Liability insurance pays for covered harm an insured driver causes to others. Uninsured motorist coverage is designed for certain losses involving a driver without applicable insurance. Underinsured motorist coverage can apply when that driver has insurance but not enough to cover a qualifying loss.
The exact protection is state-specific. Some policies focus on bodily injury, some offer property-damage coverage, and some states require an offer, a rejection form or particular limits. A deductible can apply to property damage even when bodily-injury coverage has none.
Do not assume the limit shown on the declarations page is available in every accident. Definitions of an insured person, covered vehicle, hit-and-run event, offset and stacking can materially change a claim.
Review the declarations and policy together
The declarations page gives the headline limit; the policy explains when it applies.
- Identify each coverage. Separate uninsured bodily injury, underinsured bodily injury and any property-damage coverage.
- Compare limits. Review how the chosen limit relates to liability and medical coverage.
- Read definitions. Confirm who is insured while driving, riding or walking.
- Check state rules. Ask the state insurance department about offers, rejection forms and stacking.
- Understand claims duties. Notice deadlines, police reports and consent-to-settle provisions may matter.
Three simplified accident scenarios
These examples show the coverage question, not a promise that a particular policy will pay.
| Scenario | Primary issue | Document to check |
|---|---|---|
| At-fault driver has no insurance | Uninsured motorist eligibility | Policy definition and state law |
| At-fault driver has a low liability limit | Underinsured motorist calculation | Limit, offsets and exhaustion terms |
| Hit-and-run driver is unknown | Phantom-vehicle requirements | Contact, report and notice provisions |
| Damage to your vehicle only | Property-damage protection | UMPD, collision and deductible terms |
Collision coverage can sometimes address vehicle damage regardless of the other driver’s insurance, while uninsured property-damage coverage may have different requirements.
Questions for an agent or insurer
Ask for answers tied to the policy form and endorsement numbers.
- People: Who is covered inside and outside the insured vehicle?
- Limits: Is the amount per person, per accident or combined?
- Vehicles: Can limits from multiple vehicles or policies be stacked?
- Property: Is vehicle damage included and what deductible applies?
- Procedure: What must be reported, to whom and by when?
Insurance law and contract wording vary widely by state. Use this guide to prepare questions, then rely on the policy and your state insurance department.
Use the guide for a documented decision
Before acting on Uninsured and Underinsured Motorist Coverage, write down the facts that apply to your household: the current balance or coverage, the relevant deadline, the exact contract or account terms and the amount your budget can support. Then compare those facts with the official sources below and the latest documents from the institution, insurer, employer or government agency involved.
- Save the dated statement, disclosure, policy or plan document used in the comparison.
- Separate confirmed terms from estimates, marketing language and assumptions.
- Record the question that remains unresolved and who can answer it.
- Recheck the numbers after a rate, balance, income, law or household change.
Frequently asked questions
Is uninsured motorist coverage required?
Requirements vary by state. Some require it, some require insurers to offer it, and others allow different choices.
Is underinsured coverage the same as uninsured coverage?
No. Underinsured coverage concerns an at-fault driver whose insurance is insufficient; uninsured coverage concerns a driver with no applicable insurance or another defined uninsured situation.
Does it pay to repair my car?
Only if the policy includes an applicable property-damage component or another coverage such as collision responds. Check the declarations and policy.
Sources and methodology
Primary official materials used for this guide. Checked July 28, 2026. Rules, limits and product terms can change.
- NAIC — Auto insurance consumer guide ↗Checked July 28, 2026
- NAIC — Consumer auto shopping tool ↗Checked July 28, 2026